Surprised no one has created this thread yet!
Just finished a Dual AD/AR - Dual VCA modules. EG is Ian Fritz's design made with BugBrand's PCB and the VCA is MFOS design with a board made by myself.
This last panel should wrap up my latest suitcase build! Whoo hoo!
Edit: Video here: http://youtu.be/yUUQjkOQDQA

My wife loves watching television programs and movies by streaming them online. She used to use a large and heavy laptop. For Christmas I gave her an Asus Eee Transformer tablet so she has more portability. It streams the shows fine, but the speaker in it are awful - they are very quiet and sound like crap. In addition, a lot of stuff online has very low audio levels (maybe digital stuff that was mastered at -20, and never boosted when converted and posted online). We have a pair of regular computer speakers, but then she will be tied to a power outlet and have two speakers with several wires to carry around. More portable speakers are powered from USB, which will drain the tablet battery, and many of them also have many wires to manage. I decided to make a custom speaker box for her that met several goals.

Here's the last three things I've built. These are all new designs so I'll give a little description of each one.

On the left (the one with a vertical row of switches and LEDs) is my quantizer brain and a single quantizer in one panel. The quantizer brain doesn't actually process CV, just sends information about musical modes to the quantizers digitally. The switches select the notes in the scale. These can then be stored on the eeprom and the LEDs will indicate the current note set selected. The "mode" knob selects what musical mode you're selecting from the eeprom. The "offset" knob rotates the noteset, it would be potentially useful for key changes that use the same mode without re-tuning all your oscillators. I might lose that feature. The two toggle switches below that select whether new modes are automatically transmitted to the quantizers or if you need a trigger or push-switch to cause transmission. The other toggle selects between "Live" or stored mode. The push switches are from left to right, a random mode creation switch, the transmission switch and the switch to store the current switch pattern to the eeprom. Below that are jacks for external CV to control mode selection and offset and trigger inputs for random select and mode transmission. The bottom two jacks are just an input and output for the actual quantizer. The remaining toggle switch selects between -5V/+5V and 0v/10V range for the quantizer.

The module in the middle is a CV visualizer. The LEDs are arranged like a typical piano and light up whenever the corresponding note is played (the "C" is for 0V) The plastic jack is the input and the three other jacks are just used as multiples of the input (it's nice having multiples in different spots throughout the system so you're not having to patch so physically far.

The module on the right is the Chorderizer. It's also getting digital information from the quantizer brain. It applies offsets to the input voltage and the quantizes the results and outputs them. Offsets can be stored on the eeprom and then selected with 0 to 5V CV. On the top left is a push switch for random selection of a chord. The toggle next to that determines if the offsets of the chord are applied before or after the root note is quantized. The toggle on the left in the next row changes between the knobs determining offset or the select knob/cv. The next switch sets all outputs to 1V so that the multiple oscillators can be tuned together. The push switch in the middle of the module stores the current knob positions to the EEPROM. I'm really glad I finally got this thing done.
Oh, and in the background you can see a very sloppily thrown together power supply.

i finally managed to finish at least one module: the combo amplifier/speaker module. it uses a TDA2030 IC and a visaton speaker. i will built two of these and mount them into my portable 9U system. they suck about 300mA each, so i will add an additional dedicated PSU.

This is a simple drum machine that takes a clock signal, sends it through a divider, and uses the first three divisions for the rhythm. The first division filtered to be the hi-hats, the second is the kick and the third is the snare. This creates a "four on the floor" dance beat. I filter all the divisions to get the desired sounds.

Yes it is - now completed and fully verified. As you can see, there are two PCBs - it is possible to build two different versions of the project, a simple version without voltage control just using one PCB, or a full featured fully voltage controlled version by adding the second PCB. I'm about ready to do a run of these for anyone interested._________________http://www.frequencycentral.co.uk/

Cynosure: I love the artwork Lots of detail and attention went into that didn't it? It's great _________________As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"

This is a simple drum machine that takes a clock signal, sends it through a divider, and uses the first three divisions for the rhythm. The first division filtered to be the hi-hats, the second is the kick and the third is the snare. This creates a "four on the floor" dance beat. I filter all the divisions to get the desired sounds.

Looks amazing!!!! Can't wait to hear you use it in a performance / improv

Yes it is - now completed and fully verified. As you can see, there are two PCBs - it is possible to build two different versions of the project, a simple version without voltage control just using one PCB, or a full featured fully voltage controlled version by adding the second PCB. I'm about ready to do a run of these for anyone interested.

I'd probably take. i seem to remember buying one of the PIC chips, and a little PCB.

This is a great idea; I had been thinking of similar ideas of using clock dividers for simple drum patters. I have a MiniPops that I wired up to produce a similar beat, which I've added switches to create vatiations and cancels.

I was thinking about trying to insert a pulse delay circuit to add "shuffle" to certain divisions

In a way less avantgardistic style than Jingle Joe's production, let me proudly (euphemism here) present my cigar box Mutant DS7 clone !
I'm happy with the result, happy that it's finished, happy with the process of doing it. I learned a lot, thanks to those here who helped (richardc64, metal_head_82, Jingle Joe and Fonik among them).
There's more about this project in the last pages here.

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